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Old Apr 6th 2009, 10:16 PM   #1
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Black body radiation

Jupiter has a black body temperature of 125K, but this is 20 K higher than the temperature that would be calculated from absorbed solar radiation alone. From this information, calculate the ratio of emitted radiation to absorbed solar radiation on Jupiter.

How do I start with this question?
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Old Apr 6th 2009, 10:46 PM   #2
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Try to use stefan- Boltzman law which states emissivity is proportional to the 4th power of absolute temperature. However i fail to see how it can be 20K higher. If we were to consider emission also shouldnt the temp be lower?
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black, body, radiation

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